<template>
    <el-card shadow="always" :body-style="{ padding: '20px' }">
        <el-form :inline="true" class="demo-form-inline">
            <el-form-item label="一级分类">
                <!-- 
            在select中，如果想要显示option，select必须有双向绑定一个值，值是下边所有option的某个一个value属性值（收集的是value属性值）
           -->
                <el-select placeholder="请选择" v-model="(category1Id as number)" @change="category1Change">
                    <el-option v-for="item in categoryList1" :label="item.name" :value="item.id" :key="item.id" />
                </el-select>
            </el-form-item>
            <el-form-item label="二级分类">
                <el-select placeholder="请选择" v-model="(category2Id as number)" @change="category2Change">
                    <el-option v-for="item in categoryList2" :label="item.name" :value="item.id" :key="item.id" />
                </el-select>
            </el-form-item>
            <el-form-item label="三级分类">
                <el-select placeholder="请选择" v-model="(category3Id as number)">
                    <el-option v-for="item in categoryList3" :label="item.name" :value="item.id" :key="item.id" />
                </el-select>
            </el-form-item>
        </el-form>
    </el-card>

    <button></button>
</template>
<script lang="ts">
import { defineComponent } from "vue";

export default defineComponent({
    name: "Category",
});
</script>

<script setup lang="ts">
import { onMounted } from "vue"
import { storeToRefs } from "pinia";
//引入attr的仓库
import useAttrStore from "@/stores/attr";
//获取attr仓库实例对象
const attrStore = useAttrStore()
//接收attr仓库的state数据 使用pinia提供的解构方式
const {
    categoryList1,
    category1Id,
    categoryList2,
    category2Id,
    categoryList3,
    category3Id,
} = storeToRefs(attrStore);
//初始化操作
onMounted(() => {
    //调用store中的方法，发送1级分类请求
    attrStore.getCategory1()
})
//一级分类被选择后 处理二级分类请求
const category1Change = () => {
    //先清空二级和三级的所有数据
    categoryList2.value = [];
    category2Id.value = null;
    categoryList3.value = [];
    category3Id.value = null;
    //调用store中的方法 发送2级分类请求
    attrStore.getcategoryList2()
}
//二级分类被选择后处理三级分类请求
const category2Change = () => {
    //先清空三级的所有数据
    categoryList3.value= [];
    category3Id.value = null;
    //调用store中的方法 发送3级分类请求
    attrStore.getcategoryList3()
}
</script>